If you were unfortunate enough to commit to
Destiny to an extent that you play all three classes and collected all the exotics, upgrading them all to the new baseline will cost 266 Strange Coins and 266,000 glimmer.
If you do the hardest weekly heroic strike on three characters, you get 27 strange coins per week, and the cap on the amount of glimmer you can carry at once is 25,000. So you'll have to do 10 weeks of strikes on three characters, and farm glimmer for about 12 hours, just to erase all your progress on your collection of pre-expansion exotics.
Once these items are upgraded, you'll have to complete roughly 1,200 bounties to get all the experience necessary to re-level everything. I assume you will get experience for one equipped armor and one equipped weapon simultaneously. You'll also need to collect about 3,000 destination materials, and another 200,000 glimmer to buy all the upgrades again. And spend another 266 Strange Coins to obtain 38 exotic shards for all the final upgrades.
And I hope you enjoy doing this, because presumably, this entire process will start over when the
House of Wolves expansion launches next year. This is your endgame.
http://www.polygon.com/2014/12/15/7393695/destiny-dark-below-punishing-hardcore
